Commits on Dec 5, 2019

1. Add log/fields helpers for keys from specification …

   Opentracing spec specify prefered names for log messages [1]
   This patch adds declaration for fields which are meaningful for golang
   
   - log: add helpers function for spec keys
   - ext: add LogError() helper for error
   
   LogError() helper can not be declarated in log package because it depends
   opentrace.Span which result in cyclic depencency
   
   Footnotes:
   [1] https://github.com/opentracing/specification/blob/master/semantic_conventions.md#log-fields-table

   Dmitry Monakhov committed Dec 5, 2019
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